Apparatus and method of CTCM encoding and decoding for a digital communication system
April 16, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesRobust iterative technique for high-resolution spatial processing and spectral estimation Method for a maximum likelihood decoding of a convolutional code with decision weighting, and corresponding decoder Error-correction coding method with at least two systematic convolutional codings in parallel, corresponding iterative decoding method, decoding module and decoder Method for detecting information bits processed by concatenated block codes Optimal soft-output decoder for tail-biting trellis codes Cyclic trellis coded modulation Forward error correction arrangement (FEC) for multipoint to single point communication systems Apparatus and method for using forward error correction setting to enable simultaneous use of multiple modulation systems on terrestrial distribution networks Iterative-structure digital signal reception device, and module and method therefor Non-binary viterbi decoder using butterfly operations Inventors
AssigneeApplicationNo. 09835727 filed on 04/16/2001US Classes:375/265, Trellis encoder or Trellis decoder375/262, Maximum likelihood decoder or viterbi decoder375/341, Maximum likelihood decoder or viterbi decoder714/786, Forward error correction by tree code (e.g., convolutional)714/792, Trellis code708/403, Fourier714/788, Burst error423/446, Diamond714/776, For packet or frame multiplexed data725/67, Transmitter375/348, Intersymbol interference382/232IMAGE COMPRESSION OR CODINGExaminersPrimary: Chin, StephenAssistant: Wang, Ted M. Attorney, Agent or FirmForeign Patent References
International ClassH04L 5/12AbstractA method of building systematically a multi-dimensional (n, D, L) circular trellis coded modulation (CTCM) encoder with properties of optimal energy efficiency, strong tail biting and maximum minimum distance (dmin) of trellis paths is disclosed. In addition, a communication system for use in a power limited channel application is disclosed comprising a circular trellis coded modulation (CTCM) encoder with permuted state structure for encoding based on a circular trellis path associated with a sequence of digital information bits and a set of simplexes identified for the path from a multi-dimensional signal constellation; a transmitter coupled to said CTCM encoder for transmitting said sequence of channel symbols over said channel; a receiver for receiving a transmission from said transmitter including said sequence of channel symbols and any noise induced therein; and a CTCM decoder coupled to said receiver for decoding the received transmission without knowledge of the starting state of the circular trellis path of the CTCM encoder to recover the sequence of information bits. Apparatus and methods of encoding and decoding are also disclosed utilizing a combination of circular trellis-coded modulation with permuted state structure and simplex signal constellation techniques for use in the digital communication system.Other References
Field of SearchTrellis encoder or Trellis decoderQuadrature amplitude modulation Fractionally spaced equalizer Maximum likelihood decoder or viterbi decoder SYSTEMS USING ALTERNATING OR PULSATING CURRENT Maximum likelihood decoder or viterbi decoder Intersymbol interference By filtering (e.g., digital) Correcting or reducing quantizing errors Quadrature amplitude modulation IMAGE COMPRESSION OR CODING Trellis code Forward error correction by tree code (e.g., convolutional) Viterbi decoding |
| ||||||||||||||
